Andy, good questions and as usual plenty of answers anytime an electrical related question is posted. First and most important is CHECK WITH ANY GOVERNING LOCAL AUTHORITY as its what they say NONE OF US or how we did it or think it should be done that matters. That being said and even though I've been retired from electrical power distribution design for yearsssssssssss lol here are my thoughts.
1) If youre already paying for labor and digging trenches its not that much more expensive to go ahead and run 120/240 volt services to all the locations.
2) Subject to local authority (if any exists??) you can direct trench bury Three Conductor PLUS Equipment Ground Type UF Underground Feeder UF Cable consisting of Two Hot Ungrounded Conductors (L1 & L2), One GrounDED Conductor (Neutral), One Equipment GroundING Conductor. If required I liked to place sand in the trench bottom and over the top of the cable along with yellow identifying caution tape.
3) It may cost more but buried conduit and four individual THWN encased conductors is a good method especially if you ever have trouble. In our jurisdiction it was necessary to encase the conduit in concrete if placed under a driveway etc.
4) In either (UF or Conduit) system I specified Rigid or IMC Conduit with appropriate wide sweeping ends, any necessary expansion, appropriate plastic bushings if needed where it comes out of the ground for entry into the building.
5) At the new locations install appropriate sized SUB PANELS having electrically insulated and isolated Neutral and Equipment Ground Busses.
6) I ALWAYS specified any buildings electrical services be Grounded to all readily available local "Grounding Electrodes" such as "Made Electrodes" (driven copper ground rod or rods) or buried conductive utility pipes or structural building steel or buried grids ete etc
That's how I designed back in the day, your local jurisdiction (if any exists) may do it differently and some here may do it differently. Once the loads are computed and distances known you can use charts to figure wire sizes to allow for voltage drop and adequate ampacity
I SUGGEST YOU USE LOCAL AUTHORITY AND THE NEC AS A MINIMUM DESIGN GUIDE VERSUS ANY OPINIONS POSTED HERE
John T Long retired electrical power distribution design engineer so no warranty, do as you please is fine by me
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